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@mespilus Thanks, will use Soudal.
@konastab01 BT1 blurb reads well, but it gets a lot of bad reviews (especially with regard to its anti-fungal properties), and comes in white only...
ectoplasmosis
I would go with Soudal, who are a dedicated sealant manufacturer.
The Dow brands, in the UK, are handled by Geocel, who had a sealant facility in Plymouth bitd, and may be manufacturing under license.
Mapei are relatively new to sealants, filling a gap in their offering to wholesalers/pro-retailers who prefer to consolidate to as few suppliers as possible. I suspect the Mapei tube sealants are made by a large EU manufacturer, maybe even Soudal.
Performance will not vary very much as it is hard to integrate much biocide into a clear sealant, both physically and legislatively.